The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Wednesday added a high-severity flaw impacting Microsoft SharePoint Server to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerability, tracked as CVE-2026-45659 (CVSS score: 8.8), is a case of remote code execution arising from the deserialization of untrusted data. The issue

Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.

A critical vulnerability, tracked as CVE-2026-45659, in Microsoft SharePoint can allow attackers to achieve remote code execution with little effort. Microsoft released security updates to patch a high-severity SharePoint vulnerability, tracked as CVE-2026-45659 (CVSS score of 8.8), that could allow remote code execution. The flaw does not require complex conditions for exploitation, making it a […]

Microsoft has rolled out updates to fix a remote code execution vulnerability impacting SharePoint that could be exploited by bad actors in attacks without requiring any specialized conditions to be met. The vulnerability, tracked as CVE-2026-45659, carries a CVSS score of 8.8. It has been assigned an important severity. "Deserialization of untrusted data in Microsoft Office SharePoint allows

Microsoft has released patches for a high-severity remote code execution vulnerability (CVE-2026-45659) in SharePoint that may be exploited in low-complexity attacks. It affects the SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016. About CVE-2026-45659 CVE-2026-45659 stems from Shareoint deserializing untrusted data, and may be exploited by an authenticated attacker to execute code remotely on a vulnerable SharePoint Server instance – no user interaction required. “The attack complexity is Low (AC:L) because … More → The post High-severity SharePoint RCE bug patched by Microsoft (CVE-2026-45659) appeared first on Help Net Security .